from rest_framework import serializers
import re
from django_redis import get_redis_connection
from rest_framework_jwt.settings import api_settings

from goods.models import SKU
from .models import User, Address
from celery_tasks.email.tasks import send_verify_email


class CreateUserSerializer(serializers.ModelSerializer):
    """注册序列化器"""

    # 序列化器的所有字段: ['id', 'username', 'password', 'password2', 'mobile', 'sms_code', 'allow']
    # 需要校验的字段: ['username', 'password', 'password2', 'mobile', 'sms_code', 'allow']
    # 模型中已存在的字段: ['id', 'username', 'password', 'mobile']

    # 需要序列化的字段: ['id', 'username', 'mobile', 'token']
    # 需要反序列化的字段: ['username', 'password', 'password2', 'mobile', 'sms_code', 'allow']
    password2 = serializers.CharField(label='确认密码', write_only=True)
    sms_code = serializers.CharField(label='验证码', write_only=True)
    allow = serializers.CharField(label='同意协议', write_only=True) # 'true'
    token = serializers.CharField(label='token', read_only=True)

    class Meta:
        model = User  # 从User模型中映射序列化器字段
        # fields = '__all__'
        fields = ['id', 'username', 'password', 'password2', 'mobile', 'sms_code', 'allow', 'token']
        extra_kwargs = {  # 修改字段选项
            'username': {
                'min_length': 5,
                'max_length': 20,
                'error_messages': {  # 自定义校验出错后的错误信息提示
                    'min_length': '仅允许5-20个字符的用户名',
                    'max_length': '仅允许5-20个字符的用户名',
                }
            },
            'password': {
                'write_only': True,
                'min_length': 8,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'max_length': '仅允许8-20个字符的密码',
                }
            }
        }

    def validate_mobile(self, value):
        """单独校验手机号"""
        if not re.match(r'1[3-9]\d{9}$', value):
            raise serializers.ValidationError('手机号格式有误')
        return value

    def validate_allow(self, value):
        """是否同意协议校验"""
        if value != 'true':
            raise serializers.ValidationError('请同意用户协议')
        return value

    def validate(self, attrs):
        """校验密码两个是否相同"""
        if attrs['password'] != attrs['password2']:
            raise serializers.ValidationError('两个密码不一致')

        # 校验验证码
        redis_conn = get_redis_connection('verify_codes')
        mobile = attrs['mobile']
        real_sms_code = redis_conn.get('sms_%s' % mobile)
        # 向redis存储数据时都是以字条串进行存储的,取出来后都是bytes类型 [bytes]

        if real_sms_code is None or attrs['sms_code'] != real_sms_code.decode():
            raise serializers.ValidationError('验证码错误')

        return attrs

    def create(self, validated_data):
        # 把不需要存储的 password2, sms_code, allow 从字段中移除
        del validated_data['password2']
        del validated_data['sms_code']
        del validated_data['allow']
        # 把密码先取出来
        password = validated_data.pop('password')
        # 创建用户模型对象, 给模型中的 username和mobile属性赋值

        user = User(**validated_data)

        user.set_password(password)  # 把密码加密后再赋值给user的password属性
        user.save()  # 存储到数据库



        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER  # 引用jwt中的叫jwt_payload_handler函数(生成payload)
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER  # 函数引用 生成jwt

        payload = jwt_payload_handler(user)  # 根据user生成用户相关的载荷
        token = jwt_encode_handler(payload)  # 传入载荷生成完整的jwt

        user.token = token

        return user


class UserDetailSerializer(serializers.ModelSerializer):


    class Meta:
        model = User
        fields = ['id', 'username', 'mobile', 'email_active','email']


class EmailSerializer(serializers.ModelSerializer):
    """更新邮箱序列化器"""

    class Meta:
        model = User
        fields = ['id', 'email']
        extra_kwargs = {
            'email': {
                'required': True
            }
        }

    def update(self, instance, validated_data):
        """重写此方法目录不是为了修改,而是借用此时机 发激活邮箱"""
        instance.email = validated_data.get('email')
        instance.save()

        # 将来需要在此继续写发邮箱的功能
        # send_mail()
        # http://www.meiduo.site:8080/success_verify_email.html?tokne=1
        verify_url = instance.generate_email_verify_url()
        send_verify_email.delay(instance.email, verify_url=verify_url)

        return instance

    # 省市区模块


class UserAddressSerializer(serializers.ModelSerializer):
    """
    用户地址序列化器
    """
    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label='省ID', required=True)
    city_id = serializers.IntegerField(label='市ID', required=True)
    district_id = serializers.IntegerField(label='区ID', required=True)

    class Meta:
        model = Address
        exclude = ('user', 'is_deleted', 'create_time', 'update_time')

    def validate_mobile(self, value):
        """
        验证手机号
        """
        if not re.match(r'^1[3-9]\d{9}$', value):
            raise serializers.ValidationError('手机号格式错误')
        return value

    def create(self, validated_data):
        user = self.context['request'].user  # 获取用户模型对象
        validated_data['user'] = user  # 将用户模型保存到字典中
        return Address.objects.create(**validated_data)

class AddressTitleSerializer(serializers.ModelSerializer):
    """
    地址标题
    """

    class Meta:
        model = Address
        fields = ('title',)


class UserBrowserHistorySerializer(serializers.Serializer):
    """保存商品浏览记录序列化器"""
    sku_id = serializers.IntegerField(label='商品sku_id', min_value=1)

    def validate_sku_id(self, value):
        """单独对sku_id进行校验"""
        try:
            SKU.objects.get(id=value)
        except SKU.DoesNotExist:
            raise serializers.ValidationError('sku_id 不存在')
        return value

    def create(self, validated_data):

        sku_id = validated_data.get('sku_id')
        # 获取当前的用户模型对象
        user = self.context['request'].user
        # 创建redis连接对象
        redis_conn = get_redis_connection('history')
        # 创建redis 管道
        pl = redis_conn.pipeline()
        # 先去重
        pl.lrem('history_%d' % user.id, 0, sku_id)

        # 再添加到列表的开头
        pl.lpush('history_%d' % user.id, sku_id)

        # 再截取列表中前5个元素
        pl.ltrim('history_%d' % user.id, 0, 4)
        # 执行管道
        pl.execute()

        return validated_data



class SKUSerializer(serializers.ModelSerializer):
    """sku商品序列化器"""
    class Meta:
        model = SKU
        fields = ['id', 'name', 'price', 'default_image_url', 'comments']
